A collection of items that model part or all of a real world object, particularly in the context of a database, i.e., a database schema.

The structure of a database system, described in a formal language supported by the database management system (DBMS). In a relational database, the schema defines the tables, the fields in each table, and the relationships between fields and tables. Schemas are generally stored in a data dictionary. Although a schema is defined in text database language, the term is often used to refer to a graphical depiction of the database structure.

In computer science, a description of the logical organization, structure, and content of a database.